Travel Diffusers are a great way to keep unwanted odors at bay, especially in confined spaces! These bottles will keep their scent for about three months (depending on the climate and space they're used in) and are refillable! Just remove the stopper, put on the colored lid, tip upside down to wet the wooden scent holder, replace the stopper and hang. Travel Diffusers are great for hanging in vehicles, closets and other small spaces!